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Why does my window keep flashing in pygame?

I made a window in pygame, tried to make the window white and even though I only call pygame.display.update() once it keeps flashing between white and black.
This is my code:
import pygame
running = True
pygame.init()
White = (255, 255, 255)
while running == True:
screen = pygame.display.set_mode((1400, 800))
screen.fill(White)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.display.update()
I tried changing it to pygame.display.flip() but it still stayed the same.
I also tried to put pygame.display.update() out of the loop but then the screen just stayed black.

You need to create the Pygame window (pygame.display.set_mode) once before the application loop instead of constantly creating a new window in the application loop:
import pygame
running = True
pygame.init()
screen = pygame.display.set_mode((1400, 800))
White = (255, 255, 255)
while running == True:
screen.fill(White)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.display.update()

pygame surface isn't visible

I'm currently trying to follow the Introduction to Pygame tutorial and I'm stuck on one step where the speaker makes the surface. His surface is bright red while my surface isn't visible at all.
Here's the code:
import pygame
from sys import exit
pygame.init()
screen = pygame.display.set_mode((800, 400))
pygame.display.set_caption('Runner')
clock = pygame.time.Clock()
test_surface = pygame.Surface((100, 200))
test_surface.fill('Red')
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
screen.blit(test_surface, (0, 0))
pygame.display.update()
clock.tick(60)
I've already tried starting from the very beginning, my code and the steps I make are identical to his. I've also tried deleting python and pygame. I've installed Python version that the speaker has (3.9), but nothing helps.

It is a matter of indentation. You have draw the scene and update the display in the application loop:
import pygame
from sys import exit
pygame.init()
screen = pygame.display.set_mode((800, 400))
pygame.display.set_caption('Runner')
clock = pygame.time.Clock()
test_surface = pygame.Surface((100, 200))
test_surface.fill('Red')
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
# INDENTATION
#<------|
screen.blit(test_surface, (0, 0))
pygame.display.update()
clock.tick(60)

Rotate pygame screen

I want to rotate the screen of my pygame window by 90 degrees and am unable to find any function to do so. I tried p.transform.rotate() but i guess that is used for Images only. Any help would be deeply appreciated

Of course you can use pygame.transform.rotate(). pygame.display.set_mode() just generates a pygame.Surface which is associated to the display.
However, pygame.transform.rotate() returns a new but rotated pygame.Surface object. Therefore you must blit the surface back on the dispaly:
window.blit(pygame.transform.rotate(window, 90), (0, 0))
Minimal example:
import pygame
pygame.init()
window = pygame.display.set_mode((300, 300))
font = pygame.font.SysFont(None, 100)
clock = pygame.time.Clock()
text = font.render("Display", True, (255, 255, 0))
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
window.fill(0)
window.blit(text, text.get_rect(center = window.get_rect().center))
window.blit(pygame.transform.rotate(window, 90), (0, 0))
pygame.display.flip()
clock.tick(60)
pygame.quit()
exit()

Python Pygame not showing image

I have problem, image "floor.png" is not showing on screen, blue color is showing. I was searching my old codes and I do everything same as in old working game.
But still image is invisible.
import pygame
pygame.init()
display_width = 600
display_height = 900
gameDisplay = pygame.display.set_mode((display_height, display_width))
pygame.display.set_caption("Parkour")
clock = pygame.time.Clock()
lightblue = (102, 255, 255)
floorImg = pygame.image.load("floor.png")
floorX = 300
floorY = 300
crashed = False
def DrawPictures(floorX, floorY):
gameDisplay.blit(floorImg, (floorX, floorY))
while not crashed:
for event in pygame.event.get():
if event.type == pygame.QUIT:
crashed = True
DrawPictures(floorX, floorY)
gameDisplay.fill(lightblue)
pygame.display.update()
clock.tick(60)
pygame.quit()
quit()
Any help?

You blit the image on the screen surface correctly, but you just fill the screen afterwards. Just switch
DrawPictures(floorX, floorY)
gameDisplay.fill(lightblue)
to
gameDisplay.fill(lightblue)
DrawPictures(floorX, floorY)

FIX:
Problem is in the image not in code, I tried another image and the image worked ...

My Pygame image not loading

I found a tutorial online (on Youtube) and it showed me the basics of creating a game with pygame.
I saved a png image in the same folder as my py script. When I run the script it shows no error but my image does not shows in pygame window. Kindly advice
Here's the script
import pygame,sys
pygame.init()
WIDTH,HEIGHT = 640,360
screen = pygame.display.set_mode((WIDTH,HEIGHT),0,32)
clock = pygame.time.Clock()
FPS = 24
dog_img = pygame.image.load("dog.png")
#PROCESS
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
#PROCESS
#LOGIC
#LOGIC
#DRAW
screen.blit(dog_img,(0,0))
pygame.display.flip()
#DRAW
clock.tick(FPS)

Fix the indentation. screen.blit(dog_img, (0, 0)) and the two lines below should be inside of the while loop (indented with 4 spaces).
import pygame,sys
pygame.init()
WIDTH, HEIGHT = 640, 360
screen = pygame.display.set_mode((WIDTH,HEIGHT),0,32)
clock = pygame.time.Clock()
FPS = 24
# Always use `.convert()` or `.convert_alpha()`. It'll improve the performance.
dog_img = pygame.image.load("dog.png").convert_alpha()
#PROCESS
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
#LOGIC
#DRAW
screen.blit(dog_img, (0, 0))
pygame.display.flip()
clock.tick(FPS)